Eating Animals, a new documentary narrated and produced by Academy Award-winner Natalie Portman, made its world premiere recently at the Telluride Film Festival.

The film, based on the New York Times-bestselling book of the same name by Jonathan Safran Foer, aims to educate viewers about the horrors of animal agriculture by going undercover at factory farms and slaughterhouses and exposing the truth. In 2009, Portman reported ditching meat, dairy and eggs after reading Foer’s book.

Her film received a standing ovation. A vegan reception followed the screening.

It was a real eye-opener to actually see what farming was, which was people wanting to run from you, not wanting you to see the system that was in place, including these vertically integrated structures. They know deep in their core it is not right, but I actually think there is a lot of hope in that, the fact that they still know a guy with a camera shouldn’t be coming around here because it is wrong.